I wild camped for the first time last summer, it was awesome! I did it with my partner who has done it before, which helped. Totally added to the thrill, and the second time I did it (2 days later) we found a huge clearing surrounded by forest. Got up for a pee before sleeping and it was totally silent, just amazing.
Was woken up in the night by what we assumed were foxes, making such an incredible sound that I half believed my partner trying to convince me there must be bears in the woods

Our criteria when looking for a spot were; not overlooked by buildings, no livestock, not visible from roads or footpaths, could camp without damaging crops etc, reasonably flat and not too full of brambles & nettles.
We set up just before the sun went down but I'm not very good at getting up so we didn't leave as early as would probably be ideal. Camped also right near the gates of fields etc (just around the corner out of sight) so that if anyone came in in the morning we'd be obvious - sometimes livestock are moved early in the morning and it's better then to be seen and to realise straight away so you can apologise and move.
We carry a platypus water bottle and get as much water as we'll need sometime late in the day to save carrying it very far.
And of course, leave no trace. Don't forget to count all your tent pegs to make sure you haven't left any 'cos they can hurt cow's feet! Mine are painted red.
If we went too long without finding anywhere then our plan was to just knock on the door of a house and ask if we could borrow their lawn until morning, but we never had to do that in the end. Made the whole holiday
so much cheaper, and was so much more fun than campsites!